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From this thread it seems as if there were three separate schemes. The RCA radio had an RCA plug (so named...) for a wired audio connection. These also worked with their cute 45-RPM record changers.
It sounds as if the Philco was intended to be used with Philco TVs that probably were intended to include a low-power transmitter in or near the broadcast band.
The 8.5 MHz sound IF pickup sounds implausible. Even in the early TV days the sound was FM, and the AM/SW radios were AM. Also the TV IF strip would need to be very well shielded to avoid oscillation if it was intended to radiate far enough to be heard on a nearby radio.
I think that the claim of "Ready for TV" on radios of that vintage was more marketing than technology. Television was in its infancy, an expensive novelty. Manufacturers could sell more radios if the consumer had a notion that a "simple adapter" soon to be available would allow them to get video on their brand new radio.
On the other hand I think I read here of a limited number of very early televisions produced without an audio output stage or speaker. These were indeed intended for use with the amplifier and speaker of a companion radio. The RCA scheme makes the most sense to me, much like the "AUX" jacks on 1970s stereo receivers are happy with CD players and IPods that didn't exist at the time the receivers were produced.
Did Philco ever manufacture a TV set sans audio stage that coupled to their radio "The Wireless Way"?
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